Shallow-water temperature seasonality in the middle Cretaceous mid-latitude northwestern Pacific
Temperature seasonality during the middle Cretaceous provides vital information about climate dynamics and ecological traits of organisms under the conditions of the “supergreenhouse” Earth. However, sub-annual scale paleotemperature records in the mid-latitude region remain limited. In this study,...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-04-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2024.1324436/full |
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| author | Shunta Ichimura Hideko Takayanagi Hideko Takayanagi Yasufumi Iryu Yasufumi Iryu Satoshi Takahashi Tatsuo Oji |
| author_facet | Shunta Ichimura Hideko Takayanagi Hideko Takayanagi Yasufumi Iryu Yasufumi Iryu Satoshi Takahashi Tatsuo Oji |
| author_sort | Shunta Ichimura |
| collection | DOAJ |
| description | Temperature seasonality during the middle Cretaceous provides vital information about climate dynamics and ecological traits of organisms under the conditions of the “supergreenhouse” Earth. However, sub-annual scale paleotemperature records in the mid-latitude region remain limited. In this study, sclerochronological and stable oxygen isotope (δ18O) analyses of bivalve fossils from the northwestern Pacific (paleolatitude: 44°N) were used to estimate their life history and sub-annual scale temperature patterns of the middle Cretaceous. The materials studied included Cucullaea (Idonearca) delicatostriata and Aphrodina pseudoplana recovered from middle Turonian (middle Cretaceous) shallow marine deposits in Hokkaido, northern Japan. Growth increment width and shell δ18O of C. (I.) delicatostriata revealed that the growth rate was temporally maximized and then minimized, which can be interpreted as representing spring and winter growth, respectively. Approximately 25 fortnightly growth increments occurred within that cycle, suggesting that shell formation proceeded continuously throughout the year. Based on shell δ18O values, shallow-water temperatures from 28°C to 35°C with 7°C seasonality were estimated, under the assumption that seawater δ18O values were annually invariant at −1‰ relative to VSMOW. This temperature seasonality in the middle Cretaceous is more than 5°C smaller than the seasonality of modern shallow-water environments at the same latitudes. These findings, taken together with previous studies of other oceanic regions, suggest that the Northern Hemisphere had low seasonal shallow-water temperature variation of up to 10°C in the middle Cretaceous. |
| first_indexed | 2024-04-24T15:04:50Z |
| format | Article |
| id | doaj.art-020a4a0d609d402d9f7301b67b76624b |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-04-24T15:04:50Z |
| publishDate | 2024-04-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-020a4a0d609d402d9f7301b67b76624b2024-04-02T13:32:16ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452024-04-011110.3389/fmars.2024.13244361324436Shallow-water temperature seasonality in the middle Cretaceous mid-latitude northwestern PacificShunta Ichimura0Hideko Takayanagi1Hideko Takayanagi2Yasufumi Iryu3Yasufumi Iryu4Satoshi Takahashi5Tatsuo Oji6Graduate School of Environmental Studies, Nagoya University, Nagoya, JapanDepartment of Earth Science, Graduate School of Science, Tohoku University, Sendai, JapanAdvanced Institute for Marine Ecosystem Change (WPI-AIMEC), Tohoku University, Sendai, JapanDepartment of Earth Science, Graduate School of Science, Tohoku University, Sendai, JapanAdvanced Institute for Marine Ecosystem Change (WPI-AIMEC), Tohoku University, Sendai, JapanGraduate School of Environmental Studies, Nagoya University, Nagoya, JapanNagoya University Museum (NUM), Nagoya University, Nagoya, JapanTemperature seasonality during the middle Cretaceous provides vital information about climate dynamics and ecological traits of organisms under the conditions of the “supergreenhouse” Earth. However, sub-annual scale paleotemperature records in the mid-latitude region remain limited. In this study, sclerochronological and stable oxygen isotope (δ18O) analyses of bivalve fossils from the northwestern Pacific (paleolatitude: 44°N) were used to estimate their life history and sub-annual scale temperature patterns of the middle Cretaceous. The materials studied included Cucullaea (Idonearca) delicatostriata and Aphrodina pseudoplana recovered from middle Turonian (middle Cretaceous) shallow marine deposits in Hokkaido, northern Japan. Growth increment width and shell δ18O of C. (I.) delicatostriata revealed that the growth rate was temporally maximized and then minimized, which can be interpreted as representing spring and winter growth, respectively. Approximately 25 fortnightly growth increments occurred within that cycle, suggesting that shell formation proceeded continuously throughout the year. Based on shell δ18O values, shallow-water temperatures from 28°C to 35°C with 7°C seasonality were estimated, under the assumption that seawater δ18O values were annually invariant at −1‰ relative to VSMOW. This temperature seasonality in the middle Cretaceous is more than 5°C smaller than the seasonality of modern shallow-water environments at the same latitudes. These findings, taken together with previous studies of other oceanic regions, suggest that the Northern Hemisphere had low seasonal shallow-water temperature variation of up to 10°C in the middle Cretaceous.https://www.frontiersin.org/articles/10.3389/fmars.2024.1324436/fullbivalvemiddle Turonianoxygen isotopesclerochronologyYezo Group |
| spellingShingle | Shunta Ichimura Hideko Takayanagi Hideko Takayanagi Yasufumi Iryu Yasufumi Iryu Satoshi Takahashi Tatsuo Oji Shallow-water temperature seasonality in the middle Cretaceous mid-latitude northwestern Pacific Frontiers in Marine Science bivalve middle Turonian oxygen isotope sclerochronology Yezo Group |
| title | Shallow-water temperature seasonality in the middle Cretaceous mid-latitude northwestern Pacific |
| title_full | Shallow-water temperature seasonality in the middle Cretaceous mid-latitude northwestern Pacific |
| title_fullStr | Shallow-water temperature seasonality in the middle Cretaceous mid-latitude northwestern Pacific |
| title_full_unstemmed | Shallow-water temperature seasonality in the middle Cretaceous mid-latitude northwestern Pacific |
| title_short | Shallow-water temperature seasonality in the middle Cretaceous mid-latitude northwestern Pacific |
| title_sort | shallow water temperature seasonality in the middle cretaceous mid latitude northwestern pacific |
| topic | bivalve middle Turonian oxygen isotope sclerochronology Yezo Group |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2024.1324436/full |
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